High phobic anxiety is related to lower leukocyte telomere length in women

PLoS One. 2012;7(7):e40516. doi: 10.1371/journal.pone.0040516. Epub 2012 Jul 11.

Abstract

Background: Chronic psychological distress has been linked to shorter telomeres, an indication of accelerated aging. Yet, little is known about relations of anxiety to telomeres. We examined whether a typically chronic form of anxiety--phobic anxiety--is related to telomere length.

Methodology/principal findings: Relative telomere lengths (RTLs) in peripheral blood leukocytes were measured by quantitative real-time polymerase chain reaction among 5,243 women (aged 42-69 years) who: were participants in the Nurses' Health Study; were controls in prior case-control studies of telomeres and disease, or randomly selected healthy participants in a cognitive function sub-study; had completed the Crown-Crisp phobic index proximal to blood collection. Adjusted least-squares mean RTLs (z-scores) were calculated across phobic categories. Higher phobic anxiety was generally associated with lower RTLs (age-adjusted p-trend = 0.09); this association was similar after adjustment for confounders--paternal age-at-birth, smoking, body mass index (BMI) and physical activity (p-trend = 0.15). Notably, a threshold was identified. Among women with Crown-Crisp<6 points, the multivariable-adjusted least-squares mean RTL z-score = 0.02 standard units; however, among the most phobic women (Crown-Crisp ≥ 6), the multivariable-adjusted least-squares mean RTL z-score = -0.09 standard units (mean difference = -0.10 standard units; p = 0.02). The magnitude of this difference was comparable to that for women 6 years apart in age. Finally, effect modification by BMI, smoking and paternal age was observed: associations were stronger among highly phobic women with BMI ≥ 25 kg/m(2), without smoking history, or born to fathers aged ≥ 40 years.

Conclusions/significance: In this large, cross-sectional study high phobic anxiety was associated with shorter telomeres. These results point toward prospective investigations relating anxiety to telomere length change.

Publication types

  • Research Support, N.I.H., Extramural

MeSH terms

  • Adult
  • Aged
  • Anxiety Disorders / genetics*
  • Body Mass Index
  • Female
  • Humans
  • Least-Squares Analysis
  • Leukocytes / metabolism*
  • Middle Aged
  • Paternal Age
  • Smoking / genetics
  • Telomere Homeostasis / genetics*